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Electrothermal pumping with interdigitated electrodes and resistive heaters.

Stuart J Williams1, Nicolas G Green2

  • 1Department of Mechanical Engineering, University of Louisville, Louisville, KY, USA.

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Summary

This study enhances electrothermal pumping in lab-on-a-chip devices by integrating a thin film heater. This allows independent control of thermal fields, improving fluid flow for microfluidic applications.

Keywords:
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Area of Science:

  • Microfluidics
  • Electrokinetics
  • Heat Transfer

Background:

  • Interdigitated electrodes in lab-on-a-chip devices enable dielectrophoresis and electrokinetic flow.
  • Symmetrical electrode designs limit bulk electrohydrodynamic pumping.
  • Intrinsic electrothermal pumping is influenced by fluid properties and Joule heating.

Purpose of the Study:

  • To enhance bulk electrothermal pumping in microfluidic devices.
  • To demonstrate the integration of an underlying thin film heater for independent thermal field control.
  • To optimize the interplay between electrokinetics, heat transfer, and fluid dynamics.

Main Methods:

  • Incorporation of a thin film heater electrically isolated from interdigitated electrodes.
  • Numerical simulations to analyze heater-electrode geometry, electrode dimensions, and spacing.
  • Investigating the influence of heater location and electrode spacing on pumping rate.

Main Results:

  • Integrated heaters enable controlled thermal field generation, independent of electric fields.
  • Heater location and electrode spacing significantly impact electrothermal pumping rates.
  • Electrode width and insulator thickness have less influence on pumping efficiency.

Conclusions:

  • Integrated heaters effectively enhance bulk electrothermal pumping in microfluidic devices.
  • Optimized system design requires balancing electrokinetic, thermal, and fluid dynamic parameters.
  • This approach facilitates advanced lab-on-a-chip systems combining electrothermal pumping with dielectrophoresis.